Area within the coexistence curve of an isobaric phase diagram (temperature vs composition) or an isothermal phase diagram (pressure vs composition).
A @[email protected] gap is observed at temperatures below an @[email protected] (UCST) or above the lower @[email protected] (LCST). Its location depends on pressure. In the @[email protected] gap, there are at least two phases coexisting.
PAC, 2004, 76, 1985. (Definition of terms related to polymer blends, composites, and multiphase polymeric materials (IUPAC Recommendations 2004)) on page 1996 [Terms] [Paper]